Sewing machine shuttle



June 30, 1931.

N. D. KEITH SEWING MACHINE sHUTTLE Filed Aug. 2, 1930 "y Z-b'e/z or. A m f lay" MKM@ @6.0 Qn...

kPatented June 30, 1931 V NATHAN n. KEITH, OE DEDIIA'M, MAssAoHUsETTsjAssIGNOE To vTHE-WEST ENIDA 5 THREAD OOMPANY,1OE BOSTON, MASSACHUSETTS, A CORPORATION OE MAssA- oIIUsETTs' SEWING MACHINE SHUTTLE t Application i mea August V21a3O. serial No. 472,550,v .y

This invention relates especially, althoughl not exclusively, `to rotary o r oscillatory sewing machine shuttles of the kdiscoidal type, such, for example, as those extensively employed in certain kinds Ofshoe sewing-maehines. Inshuttles of'this type thev thread is 4usually wound upon a bobbin whichlis rotatably supported on a cylindrical post or study projecting axially'from the bottom or closed side of the shuttle] The ,bobbin is` freely rotatable onthe stud and there is nothing to prevent it from coming ofi' except gravity and the direction of pull-,oil of the thread.r In order to retain the bobbin more securely in the: shuttle and atv the same time apply a certain tension tothe thread, various devices have beenproposed. kSome fof c these have beenarrangedto bear frictionally against the wall of theopening inthe bobbin,but lthese devices have offered no j Lpositive resistance to the escape of the bobembodiments thereofl illustratedv in the'ac bin,vw-hile the frictionalresistance against such escape is limited by thetension which can be applied to thethread.v Other devices of this character as heretofore proposed have,v

included positive catches `for engaging over the outer faceof 'thebobbim rtherebyprO- viding a positive lock but making it difficult to remove the bobbin when itY is desired to` Y.

' I tral opening 24 of a,y threadcop 25, saidV replace the same.

vThe present inventionV has `for its general objects to yovercome the above di'iiiculties and to provide means for securely( retrainingthe leasably secure a thread cop directly'in the shuttle. These and fotherobjectsio'f the in'- vention will best be understood fromthe following description of certain preferred companying drawings, in which .f Fig. 1 Vis a central or axial section of a shuttle embodying the invention, v

Fig. 2 is a perspective view ofthe shuttle` body per se,

n15, which maybe of any suitable or well axial boss18` on they bottom' or j closed side yof the shuttle bodyQ The post 16 isprovided i witha transverse bore19ftoreceive aspring Y .between which is interposed a spring 21, the f l o, Y

Fig. 3 is a perspective vviewpof a thread:

jsphQwnain Fig. 2,:

thread supportingpost, 1 y y i Fig. 5 is a sectional perspective view of the thread carrying sleeve, 2 Y Fig.. 6 .is `a fragmentary `sectional view similar to Figfl illustratinga modification.

'Referring to Figs. 1 tol 5, the shuttlevbody known. "'formgis provided with the.y usual lcop f adapted:for'v use` the lshuttle body detailperspective view oithek y y OO f centralfor laxial .thread supporting post 16'V the' inner end 17 of which is reduced in diam-l eter 'and threaded into suitably formed pressedv detent in the form `of, two v.balls 20 ends of the bore .beingpeened over or partly closedwso'asto hold the balls againstv escaping entirely *while permittingtthemto pro-` ject vsomewhat from'the lsuiuFaceofE the stud. l f

:The f balls 20 lengage van interior vannular `groove 22 `formedintermefdiate theends of t 'a' threadcreceiving sleeve or cap 2 3`adapted to-telescope 4over and rotatably lit the post p I 1,6.;v Said sleeve or cap is also adaptedto be A forced linto and held snugly within the cen-g sleeve having its inner end 2,6 taperedato facilitate such insertion, and is formed' at its Outer end with an exterior annular flange 27 to engage the outer face ofthe cop'. `When the sleeve.23 is inserted within 'ther'i opening24 of the cop'25a'nd is then placed in position on ythe post 16,`asv shown in Fig.'y f l .1, the balls 2O will be spring pressed into they groovev 22, thereby 'affording al frictional resistance to the turning of theA sleeve on the positive lock` for holding'the. cop imposition f while permitting the ready removal of the` sleeve by the exertion Oia reasonable amount yoi force when the .threadis exhausted.V

As shown Yin Fig. 6, the.V invention canmalso 9C* post, `depending upon the strength of thiefv spring, and also providing a substantially hub 28 of the usual thread carrying bobbin 29 is provided intermediate its ends With an interior annular groove 30 similar to the groove 22 of the construction first described and adapted to receive the spring pressed balls 2O and to Cooperate therewith in substantially the same manner'.

Having thus described my invention, I

claim 1. In a sewing machine shuttle, in combination, a thread-supporting post, a threadcarrying sleeve adapted to telescope over and rotatably iit said post, said sleeve having intermediate its ends an interior annular groove, and said post having a transverse bore, balls seated in and projecting from the ends of said bor'e, and a 'spring interposed between said balls for pressing the same irto engagement with said groove when said sleeve is in position on said post.

2. In a sewing machine shuttle, in combination, a thread-supporting post, a sleeve substantially fitting said post and having a tapered inner end adapted to be :forced into the central opening of a thread cop and flanged outer end adapted to engage the outer face of said cop, and cooperating detent means on said post and sleeve for yicldingly resisting both rotary and axial movement of the latter with respect to the former.

3. In a sewing machine shuttle, in combination, a thread-supporting post, a threadcarrying sleeve adapted to telescope over and rotatably fit said post, said sleeve having its inner end tapered, having at its outer end an exterior annular flange, and having intermediate its ends an interior annular' groove, and a spring pressed detcnt carried by said post and engaging said groove When said sleeve is in position on said post.

In testimony Whereoi I aii'ix my signature.

NATI-IAN D. KEITH. 

